#include<stdio.h>
#include<unistd.h>

int main()
{
    pid_t id = fork();
    if(id < 0)
    {
        perror("fork");
    }
    else if(id == 0)
    {
        //child
        while(1)
        {
            printf("我是子进程 ,pid = %d ppid = %d\n",getpid(),getppid());
            sleep(1);
        }
    }
    else
    {
        //parent
        while(1)
        {
            printf("我是父进程 ,pid = %d ppid = %d\n ",getpid(),getppid());
            sleep(3);
        }
    }
    return 0;
}
